284 строки
6.8 KiB
C
284 строки
6.8 KiB
C
/*
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* linux/mm/memory_hotplug.c
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*
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* Copyright (C)
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*/
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#include <linux/config.h>
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#include <linux/stddef.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/interrupt.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <linux/pagevec.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/cpu.h>
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#include <linux/memory.h>
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#include <linux/memory_hotplug.h>
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#include <linux/highmem.h>
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#include <linux/vmalloc.h>
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#include <linux/ioport.h>
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#include <asm/tlbflush.h>
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extern void zonetable_add(struct zone *zone, int nid, int zid, unsigned long pfn,
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unsigned long size);
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static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
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{
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struct pglist_data *pgdat = zone->zone_pgdat;
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int nr_pages = PAGES_PER_SECTION;
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int nid = pgdat->node_id;
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int zone_type;
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zone_type = zone - pgdat->node_zones;
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if (!populated_zone(zone)) {
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int ret = 0;
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ret = init_currently_empty_zone(zone, phys_start_pfn, nr_pages);
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if (ret < 0)
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return ret;
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}
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memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn);
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zonetable_add(zone, nid, zone_type, phys_start_pfn, nr_pages);
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return 0;
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}
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extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
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int nr_pages);
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static int __add_section(struct zone *zone, unsigned long phys_start_pfn)
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{
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int nr_pages = PAGES_PER_SECTION;
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int ret;
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ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
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if (ret < 0)
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return ret;
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ret = __add_zone(zone, phys_start_pfn);
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if (ret < 0)
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return ret;
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return register_new_memory(__pfn_to_section(phys_start_pfn));
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}
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/*
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* Reasonably generic function for adding memory. It is
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* expected that archs that support memory hotplug will
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* call this function after deciding the zone to which to
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* add the new pages.
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*/
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int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
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unsigned long nr_pages)
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{
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unsigned long i;
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int err = 0;
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for (i = 0; i < nr_pages; i += PAGES_PER_SECTION) {
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err = __add_section(zone, phys_start_pfn + i);
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/* We want to keep adding the rest of the
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* sections if the first ones already exist
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*/
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if (err && (err != -EEXIST))
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break;
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(__add_pages);
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static void grow_zone_span(struct zone *zone,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long old_zone_end_pfn;
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zone_span_writelock(zone);
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old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
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if (start_pfn < zone->zone_start_pfn)
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zone->zone_start_pfn = start_pfn;
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zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
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zone->zone_start_pfn;
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zone_span_writeunlock(zone);
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}
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static void grow_pgdat_span(struct pglist_data *pgdat,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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unsigned long old_pgdat_end_pfn =
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pgdat->node_start_pfn + pgdat->node_spanned_pages;
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if (start_pfn < pgdat->node_start_pfn)
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pgdat->node_start_pfn = start_pfn;
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pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
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pgdat->node_start_pfn;
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}
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int online_pages(unsigned long pfn, unsigned long nr_pages)
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{
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unsigned long i;
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unsigned long flags;
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unsigned long onlined_pages = 0;
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struct resource res;
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u64 section_end;
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unsigned long start_pfn;
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struct zone *zone;
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int need_zonelists_rebuild = 0;
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/*
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* This doesn't need a lock to do pfn_to_page().
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* The section can't be removed here because of the
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* memory_block->state_sem.
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*/
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zone = page_zone(pfn_to_page(pfn));
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pgdat_resize_lock(zone->zone_pgdat, &flags);
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grow_zone_span(zone, pfn, pfn + nr_pages);
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grow_pgdat_span(zone->zone_pgdat, pfn, pfn + nr_pages);
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pgdat_resize_unlock(zone->zone_pgdat, &flags);
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/*
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* If this zone is not populated, then it is not in zonelist.
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* This means the page allocator ignores this zone.
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* So, zonelist must be updated after online.
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*/
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if (!populated_zone(zone))
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need_zonelists_rebuild = 1;
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res.start = (u64)pfn << PAGE_SHIFT;
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res.end = res.start + ((u64)nr_pages << PAGE_SHIFT) - 1;
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res.flags = IORESOURCE_MEM; /* we just need system ram */
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section_end = res.end;
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while (find_next_system_ram(&res) >= 0) {
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start_pfn = (unsigned long)(res.start >> PAGE_SHIFT);
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nr_pages = (unsigned long)
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((res.end + 1 - res.start) >> PAGE_SHIFT);
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if (PageReserved(pfn_to_page(start_pfn))) {
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/* this region's page is not onlined now */
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for (i = 0; i < nr_pages; i++) {
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struct page *page = pfn_to_page(start_pfn + i);
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online_page(page);
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onlined_pages++;
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}
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}
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res.start = res.end + 1;
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res.end = section_end;
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}
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zone->present_pages += onlined_pages;
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zone->zone_pgdat->node_present_pages += onlined_pages;
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setup_per_zone_pages_min();
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if (need_zonelists_rebuild)
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build_all_zonelists();
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vm_total_pages = nr_free_pagecache_pages();
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return 0;
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}
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static pg_data_t *hotadd_new_pgdat(int nid, u64 start)
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{
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struct pglist_data *pgdat;
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unsigned long zones_size[MAX_NR_ZONES] = {0};
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unsigned long zholes_size[MAX_NR_ZONES] = {0};
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unsigned long start_pfn = start >> PAGE_SHIFT;
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pgdat = arch_alloc_nodedata(nid);
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if (!pgdat)
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return NULL;
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arch_refresh_nodedata(nid, pgdat);
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/* we can use NODE_DATA(nid) from here */
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/* init node's zones as empty zones, we don't have any present pages.*/
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free_area_init_node(nid, pgdat, zones_size, start_pfn, zholes_size);
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return pgdat;
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}
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static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
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{
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arch_refresh_nodedata(nid, NULL);
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arch_free_nodedata(pgdat);
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return;
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}
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/* add this memory to iomem resource */
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static void register_memory_resource(u64 start, u64 size)
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{
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struct resource *res;
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res = kzalloc(sizeof(struct resource), GFP_KERNEL);
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BUG_ON(!res);
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res->name = "System RAM";
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res->start = start;
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res->end = start + size - 1;
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res->flags = IORESOURCE_MEM;
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if (request_resource(&iomem_resource, res) < 0) {
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printk("System RAM resource %llx - %llx cannot be added\n",
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(unsigned long long)res->start, (unsigned long long)res->end);
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kfree(res);
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}
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}
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int add_memory(int nid, u64 start, u64 size)
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{
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pg_data_t *pgdat = NULL;
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int new_pgdat = 0;
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int ret;
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if (!node_online(nid)) {
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pgdat = hotadd_new_pgdat(nid, start);
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if (!pgdat)
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return -ENOMEM;
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new_pgdat = 1;
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ret = kswapd_run(nid);
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if (ret)
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goto error;
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}
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/* call arch's memory hotadd */
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ret = arch_add_memory(nid, start, size);
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if (ret < 0)
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goto error;
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/* we online node here. we can't roll back from here. */
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node_set_online(nid);
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if (new_pgdat) {
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ret = register_one_node(nid);
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/*
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* If sysfs file of new node can't create, cpu on the node
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* can't be hot-added. There is no rollback way now.
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* So, check by BUG_ON() to catch it reluctantly..
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*/
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BUG_ON(ret);
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}
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/* register this memory as resource */
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register_memory_resource(start, size);
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return ret;
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error:
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/* rollback pgdat allocation and others */
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if (new_pgdat)
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rollback_node_hotadd(nid, pgdat);
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return ret;
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}
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EXPORT_SYMBOL_GPL(add_memory);
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